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Joe Grand edited this page Mar 2, 2023 · 9 revisions

On-chip debug (OCD) interfaces can provide chip-level control of a target device and are a primary vector used by engineers, researchers, and hackers to extract program code or data, modify memory contents, or affect device operation on-the-fly. Depending on the complexity of the target device, manually locating available OCD interfaces can be a difficult and time consuming task, sometimes requiring physical destruction or modification of the device.

Designed by Grand Idea Studio, the JTAGulator is an open source hardware hacking tool that assists in identifying OCD interfaces from test points, vias, component pads, or connectors of a target device.

Features

  • Detection of JTAG/IEEE 1149.1, ARM SWD, and UART/asynchronous serial
  • Direct connection to sigrok and OpenOCD
  • 24 channels with input protection circuitry
  • Adjustable target I/O voltage for level translation: 1.4 to 3.3 V
  • USB interface (FTDI FT232) for menu-based control from host computer (Windows, macOS, Linux)

JTAGulator w/ annotation

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  1. Overview
  2. Quick Start
  3. Command Set
  4. OpenOCD
  5. Logic Analyzer
  6. Hardware Modifications
  7. Frequently Asked Questions (FAQ)
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